John eohan



(No Modeg.) J. ROHAN.

RIVBTING" MACHINE. No. 274,143. Patented Mar.20, 1883.

PATENT OFFICE,

JOHN ROHAN, OF ST. LOUIS, MISSOURI.

RlVETlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 274,143, dated March 20, 1883.

Application filed October 21,1882. (N0 model.)

div To all whom it may concern l Be it known that I, JOHN ROHAN, a citizen of the United States, and residing at the city of St. Louis, in the State of Missouri, have in- 5 vented a new and useful Improvement in Riveting-Machines,of which the following is a specification.

The nature of my invention consists in the arrangement of a stationary bar or arm securely 'fixed to a suitable support, to which bar a movable lever is hinged, operated at one end by a piston to move the other extreme end, carrying the riveting device away from the bar or arm to enable the introduction of the '1 plates and rivet, and to move the same upon the work to effect the riveting by means of the rivetingdevice.

In the accompanying drawing a side elevation of my improved riveting-machine is 2o represented. a x B is a bar or arm firmly attached at one end to a suitable support, A. Suitable lugs are provided on this 'arm, to which a lever, O, is attached, capable of moving on the'connecting- 25 bolt a. At the outer end of this lever G the riveting deviceR is attached, and at the other end of said lever O a piston working in a suitable cylinder, D, is attached, for the purpose of moving the lever G in such a manner as to move the extreme outer end ot'said lever which carries the riveting device B toward the bar or arm B or some distance away from the same. The riveting device consists of a cylinder, R, in which a suitable piston, P, with piston- 55 rod attached, is made to Work backward and ,forward by suitable pressure transmitted to I said cylinder. The end of the piston-rod is i h provided with a suitable cavity corresponding with the desired shape of 'theifinished rivethead, said piston-rod and piston forming the hammer for the riveting device.

The arrangement and construction of the "cylinder D, and of the riveting device R, and which I do not claim as my invention, are simi- 1811 to that patented by John F. Allen by Let-v ters Patent Nos. 188.224, 193,631, and 194,396.

The bar or arm B acts as an anvil for the riveting-hammervP, operating in the riveting device B, and said arm Bis provided with a suitable end die, 01, to receive the end of the rivet to be headed, a

By means of pressure acting upon the piston in the cylinder D, the lever O is made to turn on its center bolt, a, so as to move the outer end (carrying the riveting device R) some distance away from the end die, d, and arm B, to enable the operator to introduce the plates or boiler-shell and fix the end of the rivet to be headed into the die d, when the action of the pressure in the cylinder D is changed so as to act against the under side of its piston, whereby the extreme end of the lever G, and consequently the riveter R, is moved upon the plates and over the rivet to .be headed, and as the plates are supported upon the die d the joint of the two plates will be acted upon bya pressure corresponding with the pressure exerted upon the piston in the cylinder 1).

The riveting device It being fixed above the rivet to be headed, as "above described, pressare is transmitted to the riveting device It, when the hammer P, working in the same, performs the operation of heading the rivet, the arm or bar B acting as an anvil for the operation of the riveting-hammer P.

What I claim as my invention, and desire to secure by Letters Patent, is-

The stationary arm B, provided with suitable end die, d, in combination with lever O, turning on a joint-bolt, a, and provided with a compression-cylinder, B, at one end, and a riveting device, R, at its outer end, arranged to operate in the manner and for the purpose substantially as described.

, JOHN ROHAN. Witnesses:

JOHN D. HENGER, I. DANBENGNAY. 

